package com.google.zxing.client.android;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Map;
import java.util.Set;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.IHardwareService;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;
import com.google.zxing.ResultMetadataType;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.camera.CameraManager;
import com.beautymiracle.androidclient.R;
import com.qianseit.westore.Run;

/**
 * This activity opens the camera and does the actual scanning on a background
 * thread. It draws a viewfinder to help the user place the barcode correctly,
 * shows feedback as the image processing is happening, and then overlays the
 * results when a scan is successful.
 * 
 */
public final class CaptureActivity extends Activity implements
		SurfaceHolder.Callback, OnClickListener {
	private static final String TAG = CaptureActivity.class.getSimpleName();

	// 延迟多少s返回结果
	private static final long DEFAULT_INTENT_RESULT_DURATION_MS = 0L;

	private static final Set<ResultMetadataType> DISPLAYABLE_METADATA_TYPES = EnumSet
			.of(ResultMetadataType.ISSUE_NUMBER,
					ResultMetadataType.SUGGESTED_PRICE,
					ResultMetadataType.ERROR_CORRECTION_LEVEL,
					ResultMetadataType.POSSIBLE_COUNTRY);

	private CameraManager cameraManager;
	private CaptureActivityHandler handler;
	private Result savedResultToShow;
	private ViewfinderView viewfinderView;
	private TextView statusView;
	private boolean hasSurface;
	private boolean flashlight;
	private IntentSource source;
	private Collection<BarcodeFormat> decodeFormats;
	private String characterSet;
	private InactivityTimer inactivityTimer;
	private BeepManager beepManager;

	ViewfinderView getViewfinderView() {
		return viewfinderView;
	}

	public Handler getHandler() {
		return handler;
	}

	CameraManager getCameraManager() {
		return cameraManager;
	}

	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);

		Window window = getWindow();
		window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
		setContentView(R.layout.capture);

		hasSurface = false;
		inactivityTimer = new InactivityTimer(this);
		beepManager = new BeepManager(this);

		// 返回
		Resources res = getResources();
		findViewById(R.id.scanner_back).setOnClickListener(this);
		// Bitmap bitmap = BitmapFactory.decodeResource(res,
		// R.drawable.button_back);
		// findViewById(R.id.scanner_back).setBackgroundDrawable(
		// Run.getDrawableList(bitmap, 0.5f));
		// 闪光灯
		// findViewById(R.id.scanner_flashlight).setOnClickListener(this);
		// Bitmap bitmap = BitmapFactory.decodeResource(res,
		// R.drawable.scanner_flashlight);
		// findViewById(R.id.scanner_flashlight).setBackgroundDrawable(
		// Run.getDrawableList(bitmap, 0.5f));
	}

	@Override
	protected void onResume() {
		super.onResume();

		// CameraManager must be initialized here, not in onCreate(). This is
		// necessary because we don't
		// want to open the camera driver and measure the screen size if we're
		// going to show the help on
		// first launch. That led to bugs where the scanning rectangle was the
		// wrong size and partially
		// off screen.
		cameraManager = new CameraManager(getApplication());
		viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
		viewfinderView.setCameraManager(cameraManager);
		statusView = (TextView) findViewById(R.id.capture_status_view);

		handler = null;

		resetStatusView();
		SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
		SurfaceHolder surfaceHolder = surfaceView.getHolder();
		if (hasSurface) {
			// The activity was paused but not stopped, so the surface still
			// exists. Therefore
			// surfaceCreated() won't be called, so init the camera here.
			initCamera(surfaceHolder);
		} else {
			// Install the callback and wait for surfaceCreated() to init the
			// camera.
			surfaceHolder.addCallback(this);
			surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		}

		beepManager.updatePrefs();
		inactivityTimer.onResume();

		source = IntentSource.NONE;
		decodeFormats = null;
		characterSet = null;

		Intent intent = getIntent();
		if (intent != null && Intents.Scan.ACTION.equals(intent.getAction())) {
			// Scan the formats the intent requested, and return the result
			// to the calling activity.
			source = IntentSource.NATIVE_APP_INTENT;
			decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);

			if (intent.hasExtra(Intents.Scan.WIDTH)
					&& intent.hasExtra(Intents.Scan.HEIGHT)) {
				int width = intent.getIntExtra(Intents.Scan.WIDTH, 0);
				int height = intent.getIntExtra(Intents.Scan.HEIGHT, 0);
				if (width > 0 && height > 0) {
					cameraManager.setManualFramingRect(width, height);
				}
			}

			String customPromptMessage = intent
					.getStringExtra(Intents.Scan.PROMPT_MESSAGE);
			// if (customPromptMessage != null) {
			// statusView.setText(customPromptMessage);
			// }

			characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);
		}
	}

	@Override
	protected void onPause() {
		if (handler != null) {
			handler.quitSynchronously();
			handler = null;
		}
		inactivityTimer.onPause();
		cameraManager.closeDriver();
		if (!hasSurface) {
			SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
			SurfaceHolder surfaceHolder = surfaceView.getHolder();
			surfaceHolder.removeCallback(this);
		}
		super.onPause();
	}

	@Override
	protected void onDestroy() {
		inactivityTimer.shutdown();
		super.onDestroy();
	}

	@Override
	public void onClick(View v) {
		if (v.getId() == R.id.scanner_flashlight) {
			flashlight = !flashlight;
			setFlashlightEnabled(flashlight);
		} else if (v.getId() == R.id.scanner_back) {
			this.finish();
		}
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			if (source == IntentSource.NATIVE_APP_INTENT) {
				setResult(RESULT_CANCELED);
				finish();
				return true;
			}
		} else if (keyCode == KeyEvent.KEYCODE_FOCUS
				|| keyCode == KeyEvent.KEYCODE_CAMERA) {
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}

	private void decodeOrStoreSavedBitmap(Bitmap bitmap, Result result) {
		// Bitmap isn't used yet -- will be used soon
		if (handler == null) {
			savedResultToShow = result;
		} else {
			if (result != null) {
				savedResultToShow = result;
			}
			if (savedResultToShow != null) {
				Message message = Message.obtain(handler,
						R.id.decode_succeeded, savedResultToShow);
				handler.sendMessage(message);
			}
			savedResultToShow = null;
		}
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		if (holder == null) {
			Log.e(TAG,
					"*** WARNING *** surfaceCreated() gave us a null surface!");
		}
		if (!hasSurface) {
			hasSurface = true;
			initCamera(holder);
		}
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		hasSurface = false;
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {

	}

	/**
	 * A valid barcode has been found, so give an indication of success and show
	 * the results.
	 * 
	 * @param rawResult
	 *            The contents of the barcode.
	 * @param barcode
	 *            A greyscale bitmap of the camera data which was decoded.
	 */
	public void handleDecode(Result rawResult, Bitmap barcode) {
		inactivityTimer.onActivity();
		ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(
				this, rawResult);

		if (barcode == null) {
			// This is from history -- no saved barcode
			handleDecodeInternally(rawResult, resultHandler, null);
		} else {
			beepManager.playBeepSoundAndVibrate();
			drawResultPoints(barcode, rawResult);
			switch (source) {
			case NATIVE_APP_INTENT:
				handleDecodeExternally(rawResult, resultHandler, barcode);
				break;
			}
		}
	}

	/**
	 * Superimpose a line for 1D or dots for 2D to highlight the key features of
	 * the barcode.
	 * 
	 * @param barcode
	 *            A bitmap of the captured image.
	 * @param rawResult
	 *            The decoded results which contains the points to draw.
	 */
	private void drawResultPoints(Bitmap barcode, Result rawResult) {
		ResultPoint[] points = rawResult.getResultPoints();
		if (points != null && points.length > 0) {
			Canvas canvas = new Canvas(barcode);
			Paint paint = new Paint();
			paint.setColor(getResources().getColor(R.color.result_image_border));
			paint.setStrokeWidth(3.0f);
			paint.setStyle(Paint.Style.STROKE);
			Rect border = new Rect(2, 2, barcode.getWidth() - 2,
					barcode.getHeight() - 2);
			canvas.drawRect(border, paint);

			paint.setColor(getResources().getColor(R.color.result_points));
			if (points.length == 2) {
				paint.setStrokeWidth(4.0f);
				drawLine(canvas, paint, points[0], points[1]);
			} else if (points.length == 4
					&& (rawResult.getBarcodeFormat() == BarcodeFormat.UPC_A || rawResult
							.getBarcodeFormat() == BarcodeFormat.EAN_13)) {
				// Hacky special case -- draw two lines, for the barcode and
				// metadata
				drawLine(canvas, paint, points[0], points[1]);
				drawLine(canvas, paint, points[2], points[3]);
			} else {
				paint.setStrokeWidth(10.0f);
				for (ResultPoint point : points) {
					canvas.drawPoint(point.getX(), point.getY(), paint);
				}
			}
		}
	}

	private static void drawLine(Canvas canvas, Paint paint, ResultPoint a,
			ResultPoint b) {
		canvas.drawLine(a.getX(), a.getY(), b.getX(), b.getY(), paint);
	}

	// Put up our own UI for how to handle the decoded contents.
	private void handleDecodeInternally(Result rawResult,
			ResultHandler resultHandler, Bitmap barcode) {
		// statusView.setVisibility(View.GONE);
		viewfinderView.setVisibility(View.GONE);

		Map<ResultMetadataType, Object> metadata = rawResult
				.getResultMetadata();
		if (metadata != null) {
			StringBuilder metadataText = new StringBuilder(20);
			for (Map.Entry<ResultMetadataType, Object> entry : metadata
					.entrySet()) {
				if (DISPLAYABLE_METADATA_TYPES.contains(entry.getKey())) {
					metadataText.append(entry.getValue()).append('\n');
				}
			}
			if (metadataText.length() > 0) {
				metadataText.setLength(metadataText.length() - 1);

			}
		}
	}

	// Briefly show the contents of the barcode, then handle the result outside
	// Barcode Scanner.
	private void handleDecodeExternally(Result rawResult,
			ResultHandler resultHandler, Bitmap barcode) {
		// viewfinderView.drawResultBitmap(barcode);

		// Since this message will only be shown for a second, just tell the
		// user what kind of
		// barcode was found (e.g. contact info) rather than the full contents,
		// which they won't
		// have time to read.
		// statusView.setText(getString(resultHandler.getDisplayTitle()));

		if (source == IntentSource.NATIVE_APP_INTENT) {
			// Hand back whatever action they requested - this can be changed to
			// Intents.Scan.ACTION when
			// the deprecated intent is retired.
			Intent intent = new Intent(getIntent().getAction());
			intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
			intent.putExtra(Intents.Scan.RESULT, rawResult.toString());
			intent.putExtra(Intents.Scan.RESULT_FORMAT, rawResult
					.getBarcodeFormat().toString());
			byte[] rawBytes = rawResult.getRawBytes();
			if (rawBytes != null && rawBytes.length > 0) {
				intent.putExtra(Intents.Scan.RESULT_BYTES, rawBytes);
			}
			Map<ResultMetadataType, ?> metadata = rawResult.getResultMetadata();
			if (metadata != null) {
				Integer orientation = (Integer) metadata
						.get(ResultMetadataType.ORIENTATION);
				if (orientation != null) {
					intent.putExtra(Intents.Scan.RESULT_ORIENTATION,
							orientation.intValue());
				}
				String ecLevel = (String) metadata
						.get(ResultMetadataType.ERROR_CORRECTION_LEVEL);
				if (ecLevel != null) {
					intent.putExtra(Intents.Scan.RESULT_ERROR_CORRECTION_LEVEL,
							ecLevel);
				}
				Iterable<byte[]> byteSegments = (Iterable<byte[]>) metadata
						.get(ResultMetadataType.BYTE_SEGMENTS);
				if (byteSegments != null) {
					int i = 0;
					for (byte[] byteSegment : byteSegments) {
						intent.putExtra(
								Intents.Scan.RESULT_BYTE_SEGMENTS_PREFIX + i,
								byteSegment);
						i++;
					}
				}
			}
			sendReplyMessage(R.id.return_scan_result, intent);
		}
	}

	private void sendReplyMessage(int id, Object arg) {
		Message message = Message.obtain(handler, id, arg);
		long resultDurationMS = getIntent().getLongExtra(
				Intents.Scan.RESULT_DISPLAY_DURATION_MS,
				DEFAULT_INTENT_RESULT_DURATION_MS);
		if (resultDurationMS > 0L) {
			handler.sendMessageDelayed(message, resultDurationMS);
		} else {
			handler.sendMessage(message);
		}
	}

	private void initCamera(SurfaceHolder surfaceHolder) {
		try {
			cameraManager.openDriver(surfaceHolder);
			// Rect rect = cameraManager.getFramingRect();
			// ((LayoutParams) statusView.getLayoutParams()).topMargin =
			// rect.bottom + 20;

			// Creating the handler starts the preview, which can also throw a
			// RuntimeException.
			if (handler == null) {
				handler = new CaptureActivityHandler(this, decodeFormats,
						characterSet, cameraManager);
			}
			decodeOrStoreSavedBitmap(null, null);
		} catch (IOException ioe) {
			Log.w(TAG, ioe);
			displayFrameworkBugMessageAndExit();
		} catch (RuntimeException e) {
			// Barcode Scanner has seen crashes in the wild of this variety:
			// java.?lang.?RuntimeException: Fail to connect to camera service
			Log.w(TAG, "Unexpected error initializing camera", e);
			displayFrameworkBugMessageAndExit();
		}
	}

	private void displayFrameworkBugMessageAndExit() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setTitle(getString(R.string.app_name));
		builder.setMessage(getString(R.string.msg_camera_framework_bug));
		builder.setPositiveButton(android.R.string.ok, new FinishListener(this));
		builder.setOnCancelListener(new FinishListener(this));
		builder.show();
	}

	public void restartPreviewAfterDelay(long delayMS) {
		if (handler != null) {
			handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
		}
		resetStatusView();
	}

	private void resetStatusView() {
		// statusView.setText(R.string.msg_default_status);
		statusView.setVisibility(View.VISIBLE);
		viewfinderView.setVisibility(View.VISIBLE);
	}

	public void drawViewfinder() {
		viewfinderView.drawViewfinder();
	}

	private void setFlashlightEnabled(boolean isEnable) {
		try {
			Method method = Class.forName("android.os.ServiceManager")
					.getMethod("getService", String.class);
			IBinder binder = (IBinder) method.invoke(null,
					new Object[] { "hardware" });

			IHardwareService localhardwareservice = IHardwareService.Stub
					.asInterface(binder);
			localhardwareservice.setFlashlightEnabled(isEnable);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}
}
